Percy's grin went crooked and he shrugged. "Of course you might have changed a great deal in the last couple of years, I don't know. Maybe it's not perfect at all for you anymore. Maybe you've become some wild woman who enjoys overcrowded bars and headlining parties with blokes like Roger Davies."
All rubbish, of course, but he knew she'd know that. He spoke dryly, as he usually did when trying to make some joke, but unlike usual Penny could usually tell when he was kidding. Most people seemed to take him at face value most of the time.
"Guinea pig?" He sniffled, straightening his shoulders and peering at her as if far too dignified for any such suggestion. "Couldn't you just call me a 'tester' or something? Sounds much more properly academic."
The humor faded into a sort of churn of happy confusion. She wanted him to stay. Well...it wasn't as if she had ever actively wanted him away from her. But. It was different suddenly. Most of their year of Hogwarts surrounded them, and it was Percy she wanted to have a drink with.
Luckily he'd been blushing nonstop for the last ten minutes, so the heat rising to his face didn't show through. "Perhaps one. It's been a while since I've had a proper whiskey."